That lightsaber is even dumber than the double bladed one. It's like they said "how can we one-up the two lightsabers stuck together?" and the legitimate, serious, best answer they could come up with was THREE lightsabers stuck together.

IT'S GOING TO BE SHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIT

If they want to make it about lightsabers again they should spend their time talking about different techniques and crap like that. They could show how different schools fight and it could be neat. A bit more nuanced.

Anyway I am still skeptical because the goddamn Skywalkers are in the movie. If they have a small role I will be happy.

I read a bit of speculation about the lightsaber. Or maybe it was just me and Neo making things up. Anyway, the idea was that the the saber is actually supposed to be a bit crap. Notice how much the blades flicker and flare, probably more than could be explained by the snow. One idea was that it's an ancient lightsaber with a design that fell out of style. Another ties into the whole Force Awakens thing. This guy came into the Dark Side on his own and has no formal training or mentor, maybe just some lore he dug up. So his saber looks like that because he doesn't really know what he's doing, only that it looks cool.